In the meantime, fans have begun to get a more complete look at Concrete and Gold. The Foo Fighters also previewed "Arrows," along with "La Dee Da," "Sunday Rain" and "Dirty Water" while out on the road. A sixth track, "Run," was released as the album's first single and video.

Still up in the air, however, is the identity of a special guest star who's been tantalizingly mentioned – but never named – by Grohl. Adele was the trendy guess at first, both because of her popularity and the fact that Concrete and Gold was produced by Greg Kurstin, who also helmed her smash album 25. Grohl shot that down, and has also said it wasn't Taylor Swift. A number of other theories remain.

Grohl directed the video for "The Sky Is a Neighborhood," and it stars his daughters – 11-year-old Violet and 8-year-old Harper. Concrete and Gold, the Foo Fighters’ ninth studio effort, is due on Sept. 15.